Typewriting-machine



F. H. ARMSTRONG.

TYPEWRlT-ING MACHINE.

APPLICATION FILED Nov, 11. 1918.

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4 SHEETS-SHEEI 2.

Snow V601 flbtow 2 1 0 F. H. ARMSTRONG.

TYPEWRITING MACHINE.

APPLICATION FILED NOV. n, 1918.

Patented Aug. 16, 1921.

4 SHEETS-SHEET 3- F. H. ARMSTRONG.

TYPEWRITING MACHINE.

APPLICATiON man NOV. n, 1918.

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FRANK AnMsT noNe; or AUBUR L N RK s i fi 51 b 'CQsfSiT irirEwiiiIrEa CQMPANY, me, or daemon; new YORK, A GORPORATI GN' or New YEjR'K;

TYPEWR TING-MACHINE.

To all whom itmag concem: V

Be it known that ILFRANK H. ARM- STRONG, a citizen of the United States of America, and a resident of Auburn, county of Cayuga, State of New York, have invented certain new (and useful Improve ments in" Typewriting-Machines, of which the following is a full and clear specifica' tion. 7

This invention has relation to that class of caseshii ts in which the case positions are obtained by shifting the segments up and down. and the object. of this invention is to improve and simplify this type of mecha nism, as more fully hereinafter set forth,

The present improvements relate, to that type of: case-shift broadly covered by a co-fl pending application filedby me on the 3rd day of October, 1918, Serial No.256,675.

In the drawings Figure l is a sideelevation' of the mecha-f nism' as it appearswhen the segment is at its upper, normal, position, the near sidewall of the frame being removed; 7

F 2 is a'similar view showin the parts adjusted to intermediate or (1211). shift position 1 V Fig. 3 is a similar view showing the parts adjusted to its lowermost or "Ti 3;, shift position; Fig. 4 is a detail perspective view hereinafter described;

Figs. 6 and 7 are similar views to the foregoing, illustrating a modified form of my apparatus.

Referring to these drawings by referencecharacters, 10 designates asegment-carrier which is arranged adjacent to the rearwall of the frame and adapted to carry the usual segment. 7 This segment-carrier 1s arranged to vertically slide on a pair of rods 12 rigidly mounted on the frame and one being arranged in each rear corner of the frame.

The segment-carrier is adapted to be pulled down to either its. middle position or its lower positionby means of a pair of arms 17 whose forward ends are rigidly atfixed to a. rock-shaft 18 journaled in the side-walls of the frame and GXllQllCllIl across the machine. The rear-ends of'the arms 17' are p'ivotally' and slidingly connected to the segment-carrier by means of an open-ended'slot formed in the rear-end of each arm and engaging a pin 19 aiiixed to the'outer face of'the segment-carrier. These machine,

Specification of Letters Patent. Application filed November 11, 1918. Serial No. mm.

are arranged'one'at each side of the and'each arm is provided with a laterally-extending lug. 20' whose upper working face inclines downwardly and forwardly. i i

The arms 17' are pulled downwardly to arms 17 thus cause the segment to descend by means of shift-levers 21 and 22, these levers'being, as usual, arranged, in, pairs adjacent to the sidewalls or the frame, each pair lying'in a vertical'plane between an arm 17: and the adjacent side-wall of theiframe; .-Each pair of shift-levers is pivotally-mounted on a short bearing 23 extending'inwardlyffrom the adjacent side-wall of the frame, and each lever carries at its rear end a forwardly-extending arm or tappet 24 so lo cated and arrangedthat when the key-end of the lever is depressed this tappet will I strike against the inclined upper side of andthus swing the arm the adjacent lugf20 1'7 downwardly against the action of a coil-v spring 25,"this sprmg'servingto normally hold the segment-carrier in its upper position. The tappet 24 on the shift-lever 22 is shorter than the tappet on the'companion lever 21, so that depression of said lever 22 will, by reason of the shorterare the work lug-ends of its tappet describes, depressthe arms 17 a less distance than when theshiftlevers 21 are depressed,so that said shiftlever 22 may be used for pulling the segment down to its mid-position, while the companion lever 21 fwill be used for pu1l-' ing the segment down to its thirdor lower position; Each of these shift-levers is held in normal position by means of a suitable spring 26 and any suitable locking-devices may be employed :to lock either ofthe shiftlevers in Iitslowe'r position to thus hold the segment in either of its lower ca'se -positions. In its normal uppermost ipos1t' on', the sege ment-carrier abuts againstsuitable adjust able stops (not'shownlaflixed to the frame,

and in its lowermost or ,Figfishift posi tion it likewise abuts against'suitable adjust able stops on the base ofthe frame. 7 The segment-carrier is positively locked in'itsnormal position by means of a pair of upstanding arms 32 whose, lower-ends are aii'iXed to a rock-shaft 33 suitably journailed in the side-walls of the frame and extending entirely across -the frame, one ofthese arms 32 being'arranged at eachslde of the maclnne,'1'n po'sltlon to be swung rearwardly to bring its upper-end under the top-lug 15 of the segment-carrier. This rockable frame (composed of the arms 32 and rock-shaft 33) is normally swung rearwardly at its upper-end by means of a coil-spring 34. Each of the arms, at its rear edge, near its upper-end, is provided with an upwardly-facing stop-lug 35, which, when the arms 32 are swung forwardly to midposition, as shown in Fig. 2, are in vertical alinement with adjustable stop-screws 36 on the top-lugs 15 of the segment-carrier.

Pivotally attached to each of the arms 32 is a forwardly-extending link 37 which is provided at its forward end with a slot 38 whose front-end is open. This slot engages the rock-shaft 18 and guides the link in sliding forwardly and backwardly. Each of these links at its upper forward corner is provided with a lateral lug 39 which lies in the path of movement of the adjacent pair of shift-levers 21, 22, so that when either of said levers is depressed it strikes against the rear edge of this lug 89 and slides the link forwardly, thus swinging the lock-and-stop arms 32 forwardly against the action of their springs 34.

At the point where the shift-levers impinge against lug 39, they are provided with beveled faces 40 facing forwardly and downwardly. The beveled or cam face 40 on the lever 22 is shorter than the companion beveled face on the companion lever 21, so that when shift-lever 22 is depressed the rockarms 32 will be pulled forwardly a less distance' than when the companion shift-lever is operated; and when either shift-lever is operated the rear-edge of lug 39 will pass upwardly in front of its co-acting beveled face and engage a forwardly-facing locking shoulder 41 on the key-lever, to thus lock or hold the rockable stop-frame in its adjusted position until the key-lever returns to normal and thus releases the lug 39. l/Vhen the rockable stop-frame is thus shifted forwardly by means of the shorter cam 40, these arms will be in mid-position, 2'. 6., with their stop-lugs 35 in alinement with the stopscrews 36, so that as the arms 17 pull down the segment the stop-screws will strike against said lugs 35 and thus arrest the segment-carrier in middle-case position. When the other shift-lever 21 is depressed to thus bring into action the longer one of the cam surfaces 40, the rockable frame will be swung far enough forwardly to permit the stopscrews 36 and their supporting cars 15 to pass down behind the lugs 35, thereby permitting thesegment-carrier to descend to lower-case position.

In the modified form of my apparatus illustrated in Figs. 5, 6 and 7, it will be observed that the pivotal point 23 of the shift-levers is arranged, as in the other form. at a point back of the impact-lug 20 carried by the arm 17, and this impact-lug has its face inclining downwardly and forwardly also as in the other form. The differential arms or tappets 24 depend from the shiftlevers at a point in front of the pivotal point 23 instead of extending forwardly from the pivotal point, as shown in the other form of my device. The cam arrangement for differentially rocking the stop-frame 82 consists in the present instance of a pair of arms 45 inclining downwardly and forwardly from the rear ends of the shift-levers, one of these arms being longer than the other and each having its lower end rounded. The lower rounded ends of these arms, when in normal position, lie immediately in front of the front inclined face of the lug 46 which is integral with the front lower end of an elongated lug 47 carried by the adjacent rocker-arm 32, this lug 46 being connected to the main part 47 by an intermediate horizontal shelf-like part 48. lVhen either one of the shift-levers is operated, the rounded nose of its depending arm 45 impinges against the beveled surface of lug 46 and depresses the same and thus tilts the rockable stop-frame, and this tilting action continues until the rounded nose of the lever runs upon the top surface of the part 48, the action of the two levers 45 being respectively illustrated in Figs. 5 and 6.

It is desirable that the lateral lug or tappet 89 on link 37 shall be extended downwardly to form a wing or flange 39 which is parallel with the link 37 and which is provided with a slot arranged coincidental with slot 38. The shaft 18 passes through both these slots, so that the link 37 is thus provided with a broad bearing on the shaft 18, to thereby insure an easy movement of the sliding link 37. And to prevent lateral swinging of the link 37, the segment-shifting arm 17 may be provided with a lateral hub 17 so that the lever 17 and its hub 17 will substantially fill the space between the flange 39 and the main part of the lever 37.

The nature and scope of the invention having been thus indicated and its preferred embodiment having been specifically described, what is claimed as new is:

1. In a typewriting machine, the combination of a frame, a support shiftable in the frame to vary the relation between printing instrumentalities and a platen, means for guiding the support to move up and down in the frame, an arm extending fore and aft of the frame pivotally connected at one end with the support and pivotally held to the frame and having a laterally extending lug intermediate its connections with the support and frame, a pair of shift-key levers fulcrumed'in the frame at the rear of the lug and overlying said lug, and a spring for normally moving the support upward, said levers being provided with parts of different length engaging the upper side of the lug at-points spaced apart longitudinally of the arm. Y

V 2. In a typewriting machine, the com-' blnation of a frame, a support shiftable 1n fore and aft of the'frame pivotally connected at one end with the, support and pivotally held to the frame and having a laterally extending lug intermediate its connections with the support and frame, a pair ofshiftlrey levers fulcrumed in. the frame at the rear of the lug and overlying said lug, and a spring for normally moving the support upward, said levers each having an arm extending forwardly from its fulcrum under the keyrarrying arm thereotand engaging the upper side of the lug, the lug-engaging arm of one lever being longer than the lug engaging arm of the other lever.

3, In a typewriting machine, a segmentcarrier and means for shifting the same embodying a pair of shift-levers and also a pair of pivotally'supported arms connected to the segment-carrier, a forwardly and rearwardly-movable case-stop, a slidable member connected tosaid case-stop and extending forwardly, means for guiding said member, and means operated by the shift-levers for sliding said member. forwardly to dilferent positions, for the purpose set forth.

4.111 a typewriting machine, a segment carrier and ,means for shifting the same embodying a pair shift-levers and also a pair of pivotallysupported arms connected to the segment-carrier, a forwardly and rearwardly-movable case-stop, a sli'dable member connectedto said case-stop and extend ing forwardly, means for guiding said mem= her, and means operated; by the shift-levers for ent positions, said latter means consisting of difierent cam faces carried by the shiftlevcrs. o

i 5. In a typewritingmachine, a segmentcarrierand means for shifting the same embodying a pair of shift-levers and also a pair of pivotally-supported arms connected to the segment-carrier, a torwardly and rearwaidly-movable case-stop, a slidable member connected to said ca e-stop and extending forwardly," means for guiding said member, and means operated by the shiftlevers for sliding said member forwardly todiiierent positions, said latter means er bodying a beveled or cam face carried by each shift lever, one cam face being shorter than the other, and .a thrust-lug carried by operate with said cam faces, p

6. Double case sh ft mechamsm fortypewriting machines comprising a support shiftsaid slidable member and adapted ;to cosliding said member forwardly to difierable different distancesin one direction from a normal position to change case, ashiftable lockinga'nd stop member for locking the support in normal position and determining the extent of movement thereof, a pair of shift-key levers connected with the support to move the same in the same direction from normal position, and asliding member movable a different distance by each shift lrey lever and connected with said locking and stop member for shifting the same from looking position to two different positions to determine the case-shift positions'to which the support is movable by the key levers.

7. In a typewriting machine, the combination of a support shiftable to vary the rela tion between printing instrumentalities and a platen, a pair of shift-key levers connected with the support to shift the same difierent distances in the same direction from normal ber cooperating with the support, a member slidable fore and aft of the machine con nected with said swinging member for actuating the same, and a cam on each shift key lever engaging said member,said cams be ing so -formed as to impart sliding movements of diiferent extent to the sliding mem-i ber. '8. In a typewriting machine, the combination of a support shiftable to vary the relation between printing instrumentalities and a platen, -means for normally moving the support upwarchan upstanding member pivotally supported to swing fore and aft of the machine and adapted'to engage the support to lock the support in its normal uppermost position, a stop carried by said member adapted to arrest the downward movement of the support at a point below its normal position, a shift-key lever con nected to move the support downward, a cam on the key-carrying arm" of said shift-' key lever, and'an actuatingmember pivotally connected with the upstanding member and operable by said cam for swinging saidupstanding member out of locking position to a position in which said stop will arrest the support. o

9. In a typewriting machine, the combination of a support shiftable to vary the relation between printing instrumentalities and a platen, means for normally moving the support upward, an upstanding member pivotally supported to swing fore and aft of the machine and adapted to engage the shiftable different distances by said cams for swinging said upstanding member out of locking position to two different positions in only one of which said stop is effective to arrest the support.

10. In a typewriting machine, the combination of a frame, a support shiftable to vary the relation between printing instrumentalities and a platen, means for guiding the support to move vertically, a spring for normally moving the support upward, a transversely extending rock shaft journaled in the frame, a pair of rock arms held to the shaft extending fore and aft of the machine and pivotally connected with the support, a pair of shift-key levers connected with one of said arms for rocking the arms downward, a member pivotally supported on the frame to swing forwardly and rearwardly and adapted to engage the support to lock the support in its normal uppermost position, a stop carried by said member adapted to arrest the support in its intermediate position, a stop on the frame for arresting the support in its lowermost position, a reciprocable member connected with the swinging member and slidably supported-on the rock shaft to move forwardly and rearwardly, and coacting cam means carried by the shift-key levers and said reciprocable member for shifting said member different distances from looking position.

11. Double case shift mechanism for typewriting machines comprising a support shiftable to change case, a pair of shift key levers, connections between the levers and support for shifting the support, a swinging member for locking the support in normal position, a stop carried by the swinging member for arresting the support in an intermediate shift position, a fixed stop for arresting the support in a maximum shift position, an actuating member pivotally connected with said swinging member, and independent cam connections between the key levers and said actuating member for shifting the swinging member a greater distance from its locking position when one key lever is operated than when the other key lever is operated to render the stop carried by the swinging member ineffective when one key lever is operated.

12. Double case shift mechanism for typewriting machines comprising a support shiftable different distances from a normal position to change case, a swinging member adapted to lock the support in normal position and carrying a stop for arresting the support in its intermediate position, a pair of shift-key levers having key-carrying arms and arms connected with the support for shifting the same from normal position, and a reciprocable member connected with said swinging member and having independent cam connections with the keycarrying arms of the shift-levers for releasing the support when either lever is operated and setting the intermediate stop in effective position when one lever is operated and in an ineffective position when the other lever is operated.

13. In a typewriting machine, the combination of a support shiftable to change case, means for guiding the support to move up and down, a rock shaft extending transversely of the machine forward of the sup port, a rock arm held to the shaft and connected at its rear end with the support and provided with a laterally extending projection, a pair of shift key levers fulcrumed at the rear of the projection and provided with key-carrying arms and arms of different length extending forwardly from their fulcrums under the key-carrying arms and over said projection, aspring for normally moving the support upward, a fore-and-aft swinging member adapted to lock the support in normal case position, a stop carried by the swinging member for arresting the support in an intermediate case position, a fixed stop for arresting the support in its lowermost case position, a reciprocable actuating device connected with said member, and independent cam connections between said device and the key-carrying arms of the shift levers for swinging said member different distances from looking position to render the stop carried thereby effective on the support when one lever is operated and ineffective when the other lever is operated.

14. In a typewriting machine, the combination of a support shiftable downward different distances to change case, means for guiding the support, a rock shaft extending transversely of the machine, a rock arm held to the shaft and connected with the support, a 'pair of shift key levers, connections between the shift key levers and rock arm for moving the support downward, a spring for normally moving the support upward, a fore-and-aft swinging locking and shift-controlling member normally locking the support in normal up permost case position, an actuating member pivotally connected at one end with the swinging member and slidably supported on the rock shaft to move fore-and-aft of the machine, and cam connections between said actuating member and the shift key levers for swinging the locking and shiftcontrolling member out of locking position to either of two different positions in one of which said locking and shift-controlling member is set to arrest the support in a case position intermediate the uppermost and lowermost case positions thereof.

15. In a typewriting machine, the combination of a support shiftable from a normal position to intermediate and maximum case shift positions, intermediate and maximum case shift levers connected with the support for shifting the support, a swinging locking and shift-controlling member adapted to lock the support in normal position, a reciprocable actuating member connected with the swinging member, and

intermediate and maximum shift-controlling member from tion to two different shift-controlling posiof November, A. independent cam connections between the case shift levers and the actuating member member endwiseto swing the locking and locking positlons.

Thisspecificatiisn signed this sixth day 1918. FRANK H. ARMSTRONG.

for moving said 

